package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * hm-dianping
 * com.hmdp.utils
 * zjj19
 * 2024/6/8
 * 12:32
 * 2024 06 55
 */
@Component
public class RedisIdWorker {

    private static final Long BEGIN_TIMESTAMP = 1704067200L;

    private StringRedisTemplate stringRedisTemplate;

    private static final int COUNT_BITS = 32;


    public RedisIdWorker(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    public long nextId(String keyPrefix) {
        //1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;

        //2.生成序列号
        //2.1获取当前日期，精确到舔
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        //2.2自增长
        Long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        //3.拼接并返回

        return timestamp << 32 | count;
    }

    /**
     * 生成第一个数据模板2024-1-1
     * @param args
     */
    public static void main(String[] args) {

        LocalDateTime date = LocalDateTime.of(2024, 1, 1, 0, 0, 0);
        long l = date.toEpochSecond(ZoneOffset.UTC);
        System.out.println(l);
    }

}
